I-924 is to seek regional center designation and approval of an EB-5 projjct with USCIS
I-526 petition is filed by the EB-5 investors immigration attorney when they are initially seeking immigration benefits through the EB-5 immigration investor program. See more about the I-526 Petition here.
The I-485 petition is filed by the EB-5 investors immigration attorney after the I-526 petition has been approved and the EB-5 investor is seeking to change their status to a conditional green card or EB-5 visa. This process can take fro 4-6 months depending on USCIS processing times and backlog. Read more about the I-485 Petition here.
The I-829 Petition is filed by the EB-5 investors immigration attorney after the investor has completed their conditional residency period and their EB-5 project has created the required number of jobs. The I-829 petition can take 1 year and potentially much longer depending on the project, the complexity of the case and processing backlogs at USCIS. You can read more about the I-829 petition here.